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  <div class="question_difficulty">
   难度：Easy
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   <h1 class="question_title">
    168. Excel Sheet Column Title
   </h1>
   <p>
    Given a positive integer, return its corresponding column title as appear in an Excel sheet.
   </p>
   <p>
    For example:
   </p>
   <pre>
    1 -&gt; A
    2 -&gt; B
    3 -&gt; C
    ...
    26 -&gt; Z
    27 -&gt; AA
    28 -&gt; AB 
    ...
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   <p>
    <strong>
     Example 1:
    </strong>
   </p>
   <pre>
<strong>Input:</strong> 1
<strong>Output:</strong> "A"
</pre>
   <p>
    <strong>
     Example 2:
    </strong>
   </p>
   <pre>
<strong>Input:</strong> 28
<strong>Output:</strong> "AB"
</pre>
   <p>
    <strong>
     Example 3:
    </strong>
   </p>
   <pre>
<strong>Input:</strong> 701
<strong>Output:</strong> "ZY"
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   <h1 class="question_title">
    168. Excel表列名称
   </h1>
   <p>
    给定一个正整数，返回它在 Excel 表中相对应的列名称。
   </p>
   <p>
    例如，
   </p>
   <pre>    1 -&gt; A
    2 -&gt; B
    3 -&gt; C
    ...
    26 -&gt; Z
    27 -&gt; AA
    28 -&gt; AB 
    ...
</pre>
   <p>
    <strong>
     示例 1:
    </strong>
   </p>
   <pre><strong>输入:</strong> 1
<strong>输出:</strong> "A"
</pre>
   <p>
    <strong>
     示例&nbsp;2:
    </strong>
   </p>
   <pre><strong>输入:</strong> 28
<strong>输出:</strong> "AB"
</pre>
   <p>
    <strong>
     示例&nbsp;3:
    </strong>
   </p>
   <pre><strong>输入:</strong> 701
<strong>输出:</strong> "ZY"
</pre>
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